I went through LFI also, and I understand the logic. At the same time, though, it can be argued that pinning the grip safety makes the weapon safer because, as long as the four rules are followed, it is one less unnecessary mechanical device that must be negotiated, and that must not fail, for the shot to go where intended.
Personally, I do not deactivate my grip safety. In the minds of the average non-gunny juror, it is more likely I think that he will be swayed by the argument that deactivating any safety is dangerous (without regard to the facts behind the arguments) than by the suggestion that deactivating it renders the weapon - or perhaps the firing sequence - safer.
Bottom line is that all you are doing by deciding NOT to pin the safety is PERHAPS reducing one small factor that will come into play if you are prosecuted or sued for using your weapon in defense. I often read folks saying that since it's only one factor among many, it is unimportant. I tend to think that all are important, not by itself but when added to all the other factors that can be prepared for, because by maximizing your benefit from as many small factors as possbile you end up increasing your odds overall.
Best,
Jon